/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.edu.thu.laud.utils.serde;

import java.nio.ByteBuffer;

import org.apache.cassandra.utils.ByteBufferUtil;
import org.datanucleus.store.types.ObjectStringConverter;

/**
 * Converts from ByteBuffer to string
 * @author zhuoan
 * 
 */
public class ByteBufferStringConverter implements ObjectStringConverter {



	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.datanucleus.store.types.ObjectStringConverter#toObject(java.lang.
	 * String)
	 */
	@Override
	public Object toObject(String str) {

		if (str == null || str.length() == 0) {
			return null;
		}

		return ByteBufferUtil.hexToBytes(str);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.datanucleus.store.types.ObjectStringConverter#toString(java.lang.
	 * Object)
	 */
	@Override
	public String toString(Object obj) {

		if (!(obj instanceof ByteBuffer)) {
			return null;
		}

		return ByteBufferUtil.bytesToHex((ByteBuffer)obj);
	}

}
